From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Chart of rear axle motion experiments for the Phantom 98 N.K. comparing different damping settings on various road surfaces.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan207 | |
| Date | 29th October 1928 | |
| REAR AXLE MOTION EXPERIMENTS. — PHANTOM 98 N.K. SHEET 2 BURTON ROAD. RAILWAY LEVEL CROSSING COMING IN TOWARDS DERBY. 23 M.P.H. x 4.12 No DAMPERS. x 5.34 HARTFORDS ONLY SET AT 40 LBS. 35 M.P.H. x 8.88 No DAMPERS. HARTFORDS ONLY SET AT 40 LBS. BURTON RD. HUMP - BACK BRIDGE. M.P.H. GOING OUT, FROM DERBY. ALL X 11.6 35 AXLE HEAVILY DAMPED. NO SHOCK ABSORBERS 40 HEAVY DAMPING COMING IN TOWARDS DERBY. 35 HEAVY DAMPING NO SHOCK ABSORBERS. ROLLS-ROYCE LIMITED PRINT ROOM 31 OCT 1928 TSu. 29/10/28 | ||